core shell: add restx.app.package declaration in generated AppServer
core: minor: log classpath resource updated when change is detected, not on actual copy

this makes it much less verbose on full rebuild
barbary watch: FIX: false DELETE events during first detection

due to incorrect file comparison, now always use absolute path
common: coalesce file events

+ more consistent file events, always relative to initial watched dir
api-docs: allow to filter apis in api-docs by group,

with restx-admin group filtered out by default
this required to add resource group information in generated api description
admin: set group to restx-admin for admin resources
factory: FIX: SystemPropertyMachine is declared manually

can't declare automatically with @Machine in restx-factory itself, otherwise a clean build doesn't work.